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it was a saturation issue in RF, it would show up no matter what the sample rate is. Also : - RF filter are often only band specific and not channel specific (because tunable RF filters to do channel selection would be prohibitively expensive) - IF filter (or BB filters for zero-if) are then used for channel selection. So in his case being two channel in the same band (and given the architecture of the dongles), the only saturation that IF filters would provide would be against ADC saturation and it's easy to check if this happens or not just looking at the time domain signal. Cheers, Sylvain